Introduction The “summer learning effect” is where students’ school literacy achievement plateaus or declines over summer. This limits students’ levels of achievement over time which can create a barrier to decile 1 schools’ effectiveness. It is a well known effect both within New Zealand and worldwide, but there is limited research evidence on how to overcome it. Our aim was to identify factors that may help overcome the summer learning effect in reading in decile 1 schools in New Zealand. Key findings The summer learning effect was confirmed as a major barrier to ongoing achievement: the gains made over the school year disappeared. Specific preparation by teachers for students and guidance